Design of Ultra-wide Band-pass Filter Based on Metamaterials Applicable to Microwave Photonics

Abstract

We designed an ultra-wide band-pass filter applicable to microwave reflectometry for KSTAR (Korea Superconducting Tokamak Advanced Research) and to microwave photonics. The proposed ultra-wide band-pass filter exhibits a metamaterial structure characterized by a wide band, low insertion loss, and high skirt selectivity. The proposed filter is applied to enhance the linearity of reflectometry at the output of a VCO (voltage controlled oscillator). The pass-band of the proposed filter is observed at 18~28 GHz, and the out-of-band rejection is below 20 dB. Further, we constructed an unwrapped negative phase of S(2, 1) to verify the characteristics of the metamaterial. The under-and upper-band at lower limits of the pass-band are left-and right-handed, respectively. The group delay of the filter is less than 0.5 ns.

Dual-band Frequency Selective Surface Bandpass Filters in Terahertz Band

“…A Frequency Selective Surface (FSS) is a periodic assembly of one-or two-dimensional resonant structures that exhibits bandpass or bandstop filtering [21][22][23]. A common class of bandpass FSS can be constructed by placing a periodic array of conducting elements on a dielectric substrate or slots in a conducting surface.…”

Broadband and Polarization Independent Terahertz Metamaterial Filters Using Metal-Dielectric-Metal Complementary Ring Structure

“…Metamaterials are artificially constructed sub-wavelength structures, which have increasingly attracted immense attention due to their unprecedented electromagnetic properties such as negative permittivity, negative permeability and negative refractive index media to control light propagation for various purposes [1][2][3][4]. A significant breakthrough via metamaterials is to tailor the desired electromagnetic properties and to realize practical devices in the special terahertz region, a band between 0.3 THz to 10 THz that is more rarely explored than radio and optical bands [5][6][7].…”

Near-infrared Subwavelength Imaging and Focusing Analysis of a Square Lattice Photonic Crystal Made from Partitioned Cylinders

“…As an electromagnetic (EM) wave passes the border between a medium with positive refractive index and a LHM, the beam of light would be refracted to the same side of the normal line as the incident beam. Since no natural material with this specification has been discovered, in the last decade, manufactured structures with effective negative refractive index have attracted a lot of attention due to their wonderful optical properties [2,3] and imaging capabilities [4]. Such meta-materials are able to restore both the phase of propagating waves and amplitude of evanescent waves to make perfect lenses which can overcome the diffraction limit of conventional convex lenses and introduce a new class of imaging systems called "super lenses" [4].…”